Fe-Mn-Al-C series medium-manganese low-temperature steel and preparation method thereof

A technology of fe-mn-al-c and low-temperature steel, which is applied in the field of Fe-Mn-Al-C medium-manganese low-temperature steel and its preparation, can solve the problems of high production cost and difficulty of low-temperature steel, and achieve the goal of using Good performance, low cost, suitable for popularization and application

Active Publication Date: 2019-11-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the high cost and difficulty of low-temperature steel production in the prior art, and provide a Fe-Mn-Al-C series medium-manganese low-temperature steel and a preparation method thereof. The Fe-Mn-Al-C system of the present invention Al-C series medium-manganese low-temperature steel has excellent impact toughness at low temperatures and goo

Method used

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preparation example Construction

[0031] The preparation method of this Fe-Mn-Al-C system medium manganese low temperature steel of the present invention comprises the following steps:

[0032] S1. Smelting: All raw materials are smelted in an atmosphere of protective gas; specifically, high-purity manganese ingots, iron ingots, aluminum ingots and carbon powder are selected, and smelted in a vacuum induction furnace in an argon-protected atmosphere;

[0033] S2. Forging: heat the melted steel ingot and keep it warm, then forge it into a forging billet, and then air cool it to room temperature; specifically, heat the melted steel ingot to 1200-1230°C and keep it warm for 2-2.5 hours, then forge the steel ingot For forging, then air-cooled to room temperature;

[0034] S3. Hot rolling: put the billet in a heating furnace to keep warm, then roll the billet to the plate, and air cool after rolling; specifically, put the forged billet in a heating furnace and keep it warm at 1200-1250°C for 1.5-2h , and then star...

Embodiment 1

[0040] The composition of the Fe-Mn-Al-C medium manganese low temperature steel in this embodiment is calculated by mass percentage: Mn: 12.44%, Al: 4.7%, C: 0.1%, and the balance is Fe and unavoidable impurity elements .

[0041] The method for preparing the Fe-Mn-Al-C series medium manganese low temperature steel is as follows:

[0042] S1. Smelting: select high-purity manganese block, iron block, aluminum block and carbon powder, and use vacuum induction furnace for smelting under the atmosphere of argon protection;

[0043] S2. Forging: After heating the smelted steel ingot to 1200°C and keeping it warm for 2 hours, forge the steel ingot to a cross-section of 100*30mm 2 The forged billet, then air cooled to room temperature;

[0044] S3. Hot rolling: Put the forged billet in a heating furnace and keep it warm at 1200°C for 2 hours, then start multi-pass rolling to form a hot-rolled plate with a thickness of 5mm, wherein the starting rolling temperature is 1180°C, and the...

Embodiment 2

[0048] The composition of the Fe-Mn-Al-C series medium manganese low temperature steel in this embodiment is calculated by mass percentage: Mn: 12%, Al: 4.5%, C: 0.1%, and the balance is Fe and unavoidable impurity elements .

[0049] The method for preparing the Fe-Mn-Al-C series medium manganese low temperature steel is as follows:

[0050] S1. Smelting: select high-purity manganese block, iron block, aluminum block and carbon powder, and use vacuum induction furnace for smelting under the atmosphere of argon protection;

[0051] S2. Forging: After heating the smelted steel ingot to 1220°C and keeping it warm for 2.5 hours, forge the steel ingot to 100*30mm 2 The forged billet, then air cooled to room temperature;

[0052] S3. Hot rolling: put the forged billet in a heating furnace and hold it at 1200°C for 1.5h, and roll it into a hot-rolled plate with a thickness of 5.5mm. The starting temperature is 1200°C, and the final rolling temperature is 880°C; using air cooling;...

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Abstract

The invention discloses a Fe-Mn-Al-C series medium-manganese low-temperature steel and a preparation method thereof. The Fe-Mn-Al-C series medium-manganese low-temperature steel comprises the chemicalingredients of, in percentage by mass, 12-15% of Mn, 4.5-5% of Al, 0.1-0.12% of C and the balance Fe and inevitable impurity elements. According to the Fe-Mn-Al-C series medium-manganese low-temperature steel and the preparation method thereof, the austenite tissue volume fraction of the low-temperature steel is larger than or equal to 47.7%, the impact energy of a -80 DEG C charpy impact test islarger than or equal to 33 J, after forging and multipass rolling are performed on a steel blank of the same ingredients with the Fe-Mn-Al-C series medium-manganese low-temperature steel, quenching+tempering heat treatment is performed on an obtained rolled blank, the Fe-Mn-Al-C series medium-manganese low-temperature steel with excellent impact toughness at low temperature is prepared, and the preparation method for the Fe-Mn-Al-C series medium-manganese low-temperature steel is simple.

Description

technical field [0001] The invention relates to the technical field of low-temperature steel, and more specifically relates to a Fe-Mn-Al-C system medium-manganese low-temperature steel and a preparation method thereof. Background technique [0002] With the rapid development of marine activities and the widespread use of structural steel and construction machinery steel in high-latitude cold regions in low-temperature environments, the development of low-temperature structural parts has become the research focus of steel industry and scientific researchers around the world. At present, researchers are developing new low-temperature structural steels mainly by adding Ni, Cr and other alloying elements, using controlled rolling, controlled cooling and heat treatment. As commonly used low-temperature steels, materials such as 9% Ni steel and Cr-Ni austenitic stainless steel need to add a large amount of expensive Ni and Cr elements, so the cost is high. The main microstructur...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C21D8/00C21D1/18
CPCC21D1/18C21D8/005C21D2211/001C22C38/04C22C38/06
Inventor 章小峰万亚雄李家星武学俊黄贞益
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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